spacepaste

Paste details

reply | raw

  1.  
  2. #define F_CPU 6000000UL
  3. #define BAUD 9600
  5. #define UBRR F_CPU/16/BAUD-1
  7. #define DD_MOSI PB3
  8. #define DD_MISO PB5
  9. #define DD_SCK PB5
  10. #define DDR_SPI DDRB
  11. #define SS PB2
  13. #include <avr/io.h>
  14. #include <avr/interrupt.h>
  15. #include <util/delay.h>
  18. void SPI_SlaveInit(void);
  19. char SPI_SlaveReceive(void);
  20. void usart_init(unsigned int);
  21. void usart_tx(unsigned char);
  23. volatile uint8_t plant[] = {0x41,0x42,0x43,0x44,0x45,0x46};
  26. /* Limits
  27. * Low Normal
  28. * Chili 3.83V 2.85V
  29. *
  30. * */
  32. int main()
  33. {
  34. ADMUX = (1<<REFS0)|(1<<ADLAR); // Set left-adj, AREF as voltage reference and use channel 0
  36. usart_init(UBRR);
  37. SPI_SlaveInit();
  39. //ADCSRB = ~(7<<ADTS0);
  40. //ADCSRA = (1<<ADEN)|(1<<ADATE)|(1<<ADIE)|(1<<ADPS2)|(1<<ADPS1)|(1<<ADPS0); // prescaler 128
  41. ADCSRA = (1<<ADEN)|(1<<ADIE)|(1<<ADPS2)|(1<<ADPS1)|(1<<ADPS0); // prescaler 128
  44. sei();
  45. while(1)
  46. {
  47. // ADCSRA |= (1<<ADSC);
  48. _delay_ms(1000);
  49. }
  50. }
  52. void usart_init(unsigned int baud)
  53. {
  54. UBRR0H = (unsigned char)(baud>>8);
  55. UBRR0L = (unsigned char)baud;
  56. UCSR0B = (1<<RXEN0)|(1<<TXEN0)|(1<<RXCIE0);
  58. // Setting up frame-format
  59. UCSR0C = (1<<UCSZ01)|(1<<UCSZ00); // 8 data-bits
  60. UCSR0C |= (1<<USBS0); // 2 stop-bits
  61. UCSR0C |= (1<<UPM01); // parity even
  63. }
  65. void usart_tx(unsigned char data)
  66. {
  67. while (!(UCSR0A & (1<<UDRE0)))
  68. ;
  69. UDR0 = data;
  70. }
  72. void SPI_SlaveInit(void)
  73. {
  74. DDR_SPI = (1<<1)|(1<<DD_MISO); // MISO is output / PINB0 for debugging
  75. SPCR = (1<<SPIE)|(1<<SPE); // enable SPI and activate interrupt
  76. }
  78. ISR(SPI_STC_vect)
  79. {
  80. if (SPDR == 0x20)
  81. {
  82. PORTB |= (1<<1); // switch ON LED when sent value equals 0x20
  83. SPDR = 0xff;
  84. }
  85. else if (SPDR == 0x21)
  86. {
  87. PORTB &= ~(1<<1); // switch OFF LED when sent value equals 0x21
  88. SPDR = 0xee;
  89. }
  90. }
  92. ISR(ADC_vect)
  93. {
  94. usart_tx(0x0A);
  95. usart_tx(0x0D);
  96. }
  97.  
Powered by spacepaste. Paste removal.